Plug-cock.



memes Ama 9, i901.

wma-

n. is. mms. PLG GCK (Application mea oct. 1s, 1899.)

(Piu Mode.)

fineasesf i; D

airs

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PLUGCCK.

SIJECFCATIN forming part of Letters Patent No. 671,678, dated April 9, IQOl.

application filed October 1S, 1399. Serial No. 733,963. (No model."

to have an injurious effect upon the'metal of the cock, the object of my invention being to provide a cock having an outer surface of material adapted to resist corrosion, and also and more particularly to provide a cock at once eiicient and of exceedingly cheap construction.

My cachait should be mentioned, are particularly designed for use in cock-casings haw ing elastic bearing faces for the cock, en-

abling ree to adapt my improved plng-cocks for use without any 'machining which of course greatly decreases their cost.

Generally speaking, my invention consists in forming the core or central part of a plugcock of iron or other strong metal and providing it with an outer surface of a more fusible metal, preferably of the character known as Babbitt metal, united to the cock proper by casting. Ilhis coating of fusible and resistent metal can be given a bearingsurface suiiiciently accurate for use in a casing having eiastic bearing* surfaces in vthe mold in which it is cast.

lu order to insure a perfect union between the core and the surfacenietals, I prefer to form the surface of the core of the plug With indentations which afford an anchorage for the metal cast around it to form the surface, and I have also found it advantageous and decidedly advisable to coat the core of the plug first with tin and then' cast the fusible metal' forming the outer surface around the tiu= coated core, so as to make a union by fusion both with the tin and the core. i

Reference being now had'y "to the drawings in which my invention is illustrated, Figure l -is a vertical section through the plug and plugn casing, taken as on the section-line 1 of Fig. 2. Fig. 2 is a cross-section taken as on the B indicates the 'elastic packing, secured in the groove et.

C is the plug, formed with a passageway() leading through it, a stein C2, and a squared extension C3. The body of the plugis formed with indentations or cavities, as indicated at c.

D indicates the coating of tin with which ,I prefer to cover the plug preparatory to casting around it. The outer bearing-surface D, is made of a metal more fusible than the body oi' the plug C and is united to it by.

fusion, entering the cavities c and forming a series of anchors d', which counteract any tendency in the outer metal casing to break away lfrom the central plug.

I While with metals such as are used for mal;- ing the body of the plug a suiciently smooth surface cannot be secured by casting, but With theinore fusible metal forming the coating D' a surface sufficiently smoothand acourate to work in connection with an elastic packing B can readily he secured and the plug nished ready for use without an y machin ing.

E, Fig. l, is a packing-ring,- and F a' gland.

Having now described myinvention, what I claim as new, and desire to secure by Letters Patent, is

l. A rotary valve-plug formed of a strong cast metal having an outer covering of a more fusible metal cast aroundit, said cast metallic covering having a moldi nished outeil surface.

2. A rotary valve-plug formed of a'strong cast metal with indentations c in its surface and having an outer covering oi' a more fusible-metal cast around it.

3. A rotary valveplug formed of a strong cast metal having a layer of tin on its outer surface and a covering of a metal more fusible than the plug proper united to the tinand through it to the plug by fusion.

4f. A rotary valve-plug formed of 'astrong cast metal with indentatious c in its surface v formed in it and packed with elastic packing when tic packing'. v

HENRIK J. KREBJS. Witnesses:

RAYMOND'P. A. CoLBEn'r, CHARLES GREEN.

and having a layer of tin on its oter sl'nface and a. covering'vof` a metal more fusible than the plugproperI united to the tin and through it to the plug by fusion.

5. A rotary valve-easing having channels material in combination with a valve-plug formed of a strong cast metal, havingan outer 

